2.1.1273 Part 1 Section 220.127.116.11, sp3d (Apply 3D shape properties)
a. The standard does not describe default behavior when contourClr and extrusionClr child elements are unspecified.
In Office, child element contourClr defaults to black and child element extrusionClr defaults to the front face color.
b. The standard does not describe default behavior when contour width is zero.
In Office, if the contour width is zero, then no contour is presumed and contour color is ignored.